[chore] Rename agent config to agent template

[junaway]

Context

The agent authoring type was named agent_config / AgentConfig everywhere, out of step with the prompt-template / PromptTemplate naming and with the just-landed skill-template rename. This renames the agent authoring vocabulary to "template", the same way #4900 did for skills. Naming layer only. No behavior change.

Changes

Rename agent config to agent template (mirrors prompt-template and skill-template):

• AgentConfig to AgentTemplate, AgentConfigSchema to AgentTemplateSchema.
• The whole harness-config family too: PiAgentConfig, HarnessAgentConfig, ClaudeAgentConfig, AgentaAgentConfig, ResolvedAgentConfig to ...AgentTemplate.
• Catalog type __ag_type__ / x-ag-type-ref goes from "agent_config" to "agent-template" (dash, like prompt-template).
• Web: AgentConfigControl to AgentTemplateControl (file renamed), plus agentConfigLayout to agentTemplateLayout, AGENT_CONFIG_LAYOUTS to AGENT_TEMPLATE_LAYOUTS, props and atoms.
• Services: AGENT_CONFIG_SCHEMA to AGENT_TEMPLATE_SCHEMA, _DEFAULT_AGENT_CONFIG to _DEFAULT_AGENT_TEMPLATE.
• Env var AGENTA_AGENT_CONFIG_DIR to AGENTA_AGENT_TEMPLATE_DIR (the directory holding the static on-file agent template). No back-compat.

Deliberately kept (these are not the agent template):

• AgentaClientConfig (the web Agenta API client config), AgentaConfig (the API env config), and AgentRunnerConfigurationError (the runner error).

No back-compat: every renamed type is new on big-agents, so this is a clean break with no aliases.

This branch also merges big-agents (which now carries the skill-template rename #4900). The merge combined both renames where they overlapped, so a skill referenced inside an agent template reads SkillTemplate inside AgentTemplate, and the agent template's skills field references the skill-template catalog type.

Tests / notes

• SDK agents + catalog suites green (455). Services agent green (42). API workflows green (62).
• Web: @agenta/entity-ui and @agenta/playground tsc clean; the skill control test passes post-merge (12/12).
• Full sweep: zero agent_config / AgentConfig residual in live code (the only retained occurrence is intentional, the kept identifiers above), and zero skill_config residual from the merged branch.
• Follow-up not in this PR: the agent_config to agent_template rename does not touch the Fern-generated client; it still needs an OpenAPI regen alongside the skill-template one.

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview, Comment	Jun 28, 2026 9:16am

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